CN115395529A - Offshore wind power reactive power optimization configuration method and system - Google Patents
Offshore wind power reactive power optimization configuration method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides an offshore wind power reactive power optimal configuration method and system, which comprises the following steps: respectively acquiring full-load reactive capacity and no-load reactive capacity of an offshore wind farm; the method comprises the steps of substituting operation data in pre-divided sub-areas of the offshore wind power base into a preset reactive power optimization configuration model, and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base; establishing a robust optimization model to optimize the switching group number of the reactor group according to the optimal reactive compensation configuration solution, the day-ahead power prediction data of the offshore wind turbine generator and the optimal switching time point of the in-day reactor, so as to obtain an in-day switching plan of the reactor group; and regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant and provide technical support for the stable operation of the offshore wind power.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an offshore wind power reactive power optimal configuration method and system.
Background
Offshore wind power has the advantages of not occupying land resources, high wind energy utilization rate and the like, so that the development center of the future wind power market is the focus. When offshore distance of an offshore wind farm is far, cost of alternating current remote transmission is higher than that of direct current transmission, and meanwhile, charging power of an inductor and a capacitor is too large, reactive compensation is needed, and the problems of power quality reduction and the like are caused. With the development of offshore wind power generation technology, an offshore wind power industry chain is gradually built and developed. In the process of offshore wind power generation, when the offshore booster station is more than 10 kilometers offshore, the power grid needs to be accessed through an alternating current sea cable, wherein the capacitance to ground of the alternating current cable can be increased along with the increase of the length of the cable. Due to the fact that the charging reactive power of the submarine cable is large, the voltage of a grid connection point of an offshore wind power plant is easy to exceed the limit. Therefore, for an offshore wind farm, effective reactive power control is very important for guaranteeing the voltage of a grid-connected point and the stability of the whole power farm.
In addition, as the offshore wind farm is closely electrically connected with the power grid, the fault of any one party can rapidly spread to the other party, and the phenomena of large-amplitude voltage oscillation, power angle instability and wind farm stall of the whole power supply system can be caused. Therefore, to improve the reliability of the wind power system, the reactive power needs to be adjusted to control and improve the wind farm voltage.
For an offshore wind farm, the installation cost of a reactive device is high, the installation difficulty is high, and the wind turbine generator and the reactive configuration of the offshore wind farm lack coordination control, so that the reactive regulation capability of the wind turbine generator cannot be fully utilized. The offshore wind farm adopts the double-fed asynchronous wind generating set which operates at variable speed and constant frequency, active and reactive decoupling control can be realized, so that the wind generating set and the reactive compensation device are subjected to coordinated control, the reactive power adjusting capability of the wind generating set can be fully utilized, and the installation cost of the reactive compensation device of the offshore wind farm can be reduced. In the prior art, when the wind turbine generators and the reactive power compensation device are coordinated and controlled, reactive power distribution is performed on the wind turbine generators in modes of equal proportion distribution control and the like, randomness of output power of the wind turbine generators is not fully considered, so that reactive power regulation capability of an offshore wind farm is not fully exerted, and voltage stability of a wind farm system needs to be further improved.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a solution that overcomes, or at least partially solves, the above-mentioned problems. Therefore, in one aspect of the present invention, a method for offshore wind power reactive power optimization configuration is provided, including:
step 1, respectively acquiring full reactive capacity and no-load reactive capacity of an offshore wind farm; the full-power reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind plant during full power generation; the idle reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind farm when the offshore wind farm is idle;
step 2, substituting operation data in the sub-areas of the offshore wind power base which are divided in advance into a preset reactive power optimization configuration model, and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base;
step 3, establishing a robust optimization model to optimize the switching group number of the reactor group according to the optimal reactive compensation configuration solution, the day-ahead power prediction data of the offshore wind turbine generator and the optimal switching time point of the in-day reactor, so as to obtain an in-day switching plan of the reactor group;
step 4, establishing an optimized distribution model among the wind power units for optimizing the reactive output of the offshore wind power units and the reactive output of the static reactive generators according to the solution of the optimized configuration of the reactive compensation equipment, the daily switching plan of the reactor groups and short-term predicted power data; and regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the parallel reactor and the no-load reactive capacity so as to perform reactive power compensation on the offshore wind power plant.
Further, the step 1 further comprises setting a work flow of a discrete reactive power compensation device in a grid-connected point of the offshore wind farm, and applying the set work flow to the discrete reactive power compensation device to reduce the influence degree of the fluctuation of the wind speed on the voltage of the grid-connected point; the work flow of the discrete reactive power compensation device comprises the switching group number and the switching times, and when the wind speed causes the wind power of the offshore wind power generation set to change greatly, the switching group number of the discrete reactive power compensation device at the moment is preset.
Further, the step 2 further comprises the steps of establishing an optimized distribution model among the wind power units according to the daily switching plan and the short-term predicted power data of the reactor groups to optimize the reactive power output of the offshore wind power units and the reactive power output of the static var generators, and regulating and controlling the reactive power of the offshore wind power units and the working modes of the static var generators according to the optimization results.
And step 4, regulating and controlling the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant.
Further, step 4 further comprises setting the reactive power output of each offshore wind power generation set, the reactive power output of the dynamic reactive power compensation device and performing reactive power compensation optimal configuration on the sub-regions, so that the voltage of the grid-connected point of the offshore wind power plant does not fluctuate any more, and further the reactive power compensation optimal configuration is realized on the whole offshore wind power base.
The invention also provides an offshore wind power reactive power optimization configuration system, which comprises:
the acquisition module is used for respectively acquiring full reactive capacity and no-load reactive capacity of the offshore wind farm; the full reactive power capacity is the maximum value of the absolute value of the total reactive power capacity of the offshore wind power plant during full power generation; the idle reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind farm when the offshore wind farm is idle;
the calculation module is used for substituting operation data in the sub-areas of the offshore wind power base which are divided in advance into a preset reactive power optimization configuration model and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base;
the optimization module is used for establishing a robust optimization model to optimize the switching group number of the reactor group according to the reactive compensation optimal configuration solution, the day-ahead power prediction data of the offshore wind power generation group and the optimal switching time point of the daily reactor, so as to obtain a daily switching plan of the reactor group;
the compensation module is used for establishing an optimized distribution model among the wind power units for optimizing the reactive output of the offshore wind power units and the reactive output of the static reactive generators according to the solution of the optimized configuration of the reactive compensation equipment, the daily switching plan of the reactor groups and short-term predicted power data; and regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant.
Further, the acquisition module further comprises a work flow of the discrete reactive power compensation device in the grid-connected point of the offshore wind farm, and the set work flow is applied to the discrete reactive power compensation device so as to reduce the influence degree of the fluctuation of the wind speed on the voltage of the grid-connected point; the work flow of the discrete reactive power compensation device comprises the switching group number and the switching times, and when the wind speed causes the wind power of the offshore wind power generation set to change greatly, the switching group number of the discrete reactive power compensation device at the moment is preset.
Further, the calculation module further comprises the steps of establishing an optimized distribution model among the wind power units according to the daily switching plan and the short-term predicted power data of the reactor groups to optimize the reactive power output of the offshore wind power units and the reactive power output of the static reactive power generators, and regulating and controlling the reactive power of the offshore wind power units and the working modes of the static reactive power generators according to the optimization results.
And furthermore, the compensation module further comprises a step of regulating and controlling the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and then determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant.
Furthermore, the compensation module further comprises a step of setting the reactive power output of each offshore wind power generation unit, the reactive power output of the dynamic reactive power compensation device and performing reactive power compensation optimal configuration on the sub-area, so that the voltage of a grid connection point of the offshore wind power plant is not fluctuated any more, and further the reactive power compensation optimal configuration of the whole offshore wind power base is realized.
The technical scheme provided in the embodiment of the application has at least the following technical effects or advantages:
the method and the system provided by the invention carry out reactive compensation optimal configuration on each sub-area of the offshore wind power base based on a reactive compensation optimal configuration solution, and establish an offshore wind power base reactive compensation equipment optimal configuration method by taking factors such as power balance of the offshore wind power base as constraints and taking the lowest loss of the wind power and the lowest economic cost as double targets according to the output characteristics of the wind power base. Aiming at the optimal economic operation target and the minimum active network loss target, the reactive power optimization constraint condition is combined, the reactive power compensation optimal configuration scheme is solved, and technical support is provided for stable operation of offshore wind power.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the technical solutions of the present invention and the objects, features, and advantages thereof more clearly understandable.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a flow chart of an offshore wind power reactive power optimization configuration method;
fig. 2 shows a structure diagram of an offshore wind power reactive power optimization configuration system.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, the offshore wind power reactive power optimization configuration method provided by the invention comprises the following steps:
step 1, respectively acquiring full-load reactive capacity and no-load reactive capacity of an offshore wind farm; the full reactive power capacity is the maximum value of the absolute value of the total reactive power capacity of the offshore wind power plant during full power generation; the idle reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind farm when the offshore wind farm is idle;
setting a working process of a discrete reactive power compensation device in a grid-connected point of an offshore wind power plant, and applying the set working process to the discrete reactive power compensation device so as to reduce the influence degree of wind speed fluctuation on grid-connected point voltage; the work flow of the discrete reactive power compensation device comprises the switching group number and the switching times, and when wind speed causes large-amplitude change of wind power of an offshore wind power generation unit, the switching group number of the discrete reactive power compensation device at the moment is preset.
Detecting whether the voltage of a grid-connected point of an offshore wind farm fluctuates or whether the input wind speed of each offshore wind turbine unit fluctuates; if not, keeping the original droop coefficient of the offshore wind turbine generator and the reactive power output of the dynamic reactive power compensation device; if yes, judging whether the offshore wind farm can stabilize the voltage of the grid-connected point or not based on the reactive power output of each offshore wind power generation unit and the reactive power output of the dynamic reactive power compensation device in the grid-connected point of the offshore wind farm, so that the voltage of the grid-connected point is restored to be within a stable range; if so, performing intermediate time scale control, performing optimized calculation on the droop coefficient to obtain the droop coefficient of each offshore wind turbine generator, and setting the reactive power output of the dynamic reactive power compensation device to be 0; if not, short-time scale control is carried out, the dynamic reactive power device is started to carry out reactive power compensation, the dynamic reactive power compensation device outputs reactive power output under a constant voltage mode, and the droop coefficient of each offshore wind turbine unit is set so that the reactive power output of each offshore wind turbine unit reaches a limit value;
step 2, bringing operation data in the pre-divided sub-areas of the offshore wind power base into a preset reactive power optimization configuration model, and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base;
according to the daily switching plan and the short-term predicted power data of the reactor groups, an optimized distribution model among the wind power generator groups is established to optimize the reactive power output of the offshore wind power generator groups and the reactive power output of the static reactive power generators, and the reactive power of the offshore wind power generator groups and the working modes of the static reactive power generators are regulated and controlled according to the optimized results; wherein the short-term predicted power data is acquired by the offshore wind farm according to a preset time interval.
Step 3, establishing a robust optimization model to optimize the switching group number of the reactor group according to the optimal reactive compensation configuration solution, the day-ahead power prediction data of the offshore wind power generation group and the optimal switching time point of the in-day reactor, and obtaining an in-day switching plan of the reactor group;
and when the no-load reactive capacity is larger than the full-generation reactive capacity, determining the capacity of the shunt reactor according to the no-load reactive capacity, the full-generation reactive capacity and the voltage of the grid-connected point of the offshore wind farm.
The capacity of the shunt reactor can comprise reactive compensation capacity of the shunt reactor and voltage regulation capacity of the shunt reactor; the reactive compensation capacity of the shunt reactor is the capacity of the shunt reactor for reactive compensation; the voltage regulation capacity of the shunt reactor is the capacity of the shunt reactor for regulating the voltage of the grid-connected point.
Specifically, when the empty load reactive capacity is larger than the full generation reactive capacity, the reactive compensation of the wind power plant adopts SVG and the shunt reactor for combined compensation, and the total reactive compensation capacity can be confirmed to be the empty load reactive capacity. Further, the calculation result may be obtained by calculating the idle reactive capacity and the full reactive capacity, for example, substituting the idle reactive capacity and the full reactive capacity into a preset calculation formula, and determining the value of the reactive compensation capacity of the shunt reactor as the calculation result, and meanwhile, the absolute value of the reactive compensation capacity of the shunt reactor may be less than or equal to a preset compensation capacity threshold, for example, the preset compensation capacity threshold may be half of the total reactive compensation capacity.
And 4, according to the solution of the optimal configuration of the reactive compensation equipment, a daily switching plan and short-term predicted power data of the reactor group, establishing an optimal distribution model among the wind turbine groups for optimizing the reactive output of the offshore wind turbine groups and the reactive output of the static reactive generator, regulating and controlling the reactive power of the offshore wind turbine groups and the working mode of the static reactive generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind turbine. Wherein the short-term predicted power data is acquired by the offshore wind farm according to a preset time interval.
And the droop coefficient of each offshore wind turbine unit and the reactive power output of the dynamic reactive power compensation device are used for distributing the droop coefficient to each offshore wind turbine unit, and the reactive power output of each offshore wind turbine unit is controlled according to the droop coefficient distributed to each offshore wind turbine unit. By setting the reactive power output of each offshore wind power generation unit and the reactive power output of the dynamic reactive power compensation device, the voltage of the grid-connected point of the offshore wind power plant is not recovered to be within a stable range. By setting the reactive power output of each offshore wind power generation unit, the reactive power output of the dynamic reactive power compensation device and performing reactive power compensation optimal configuration on the sub-areas, the voltage of the grid-connected point of the offshore wind power plant is not fluctuated any more, and then the reactive power compensation optimal configuration is realized on the whole offshore wind power base.
As shown in fig. 2, the offshore wind power reactive power optimization configuration system provided by the present invention includes:
the acquisition module is used for respectively acquiring full reactive capacity and no-load reactive capacity of the offshore wind farm; the full reactive power capacity is the maximum value of the absolute value of the total reactive power capacity of the offshore wind power plant during full power generation; the idle reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind farm when the offshore wind farm is idle.
Setting a working process of a discrete reactive power compensation device in a grid-connected point of an offshore wind power plant, and applying the set working process to the discrete reactive power compensation device so as to reduce the influence degree of wind speed fluctuation on grid-connected point voltage; the work flow of the discrete reactive power compensation device comprises the switching group number and the switching times, and when the wind speed causes the wind power of the offshore wind power generation set to change greatly, the switching group number of the discrete reactive power compensation device at the moment is preset.
Detecting whether the voltage of a grid-connected point of an offshore wind farm fluctuates or whether the input wind speed of each offshore wind turbine unit fluctuates; if not, keeping the original droop coefficient of the offshore wind turbine generator and the reactive power output of the dynamic reactive power compensation device; if yes, judging whether the offshore wind farm can stabilize the voltage of the grid-connected point or not based on the reactive power output of each offshore wind power generation unit and the reactive power output of the dynamic reactive power compensation device in the grid-connected point of the offshore wind farm, so that the voltage of the grid-connected point is restored to be within a stable range; if so, performing intermediate time scale control, performing optimized calculation on the droop coefficient to obtain the droop coefficient of each offshore wind turbine generator, and setting the reactive power output of the dynamic reactive power compensation device to be 0; if not, performing short-time scale control, starting the dynamic reactive power device to perform reactive power compensation, enabling the dynamic reactive power compensation device to output reactive power under a constant voltage mode, and setting a droop coefficient of each offshore wind turbine unit to enable the reactive power of each offshore wind turbine unit to reach a limit value;
the calculation module is used for bringing operation data in the pre-divided sub-areas of the offshore wind power base into a preset reactive power optimization configuration model and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base;
according to the daily switching plan and the short-term predicted power data of the reactor groups, an optimized distribution model among the wind power generator groups is established to optimize the reactive power output of the offshore wind power generator groups and the reactive power output of the static reactive power generators, and the reactive power of the offshore wind power generator groups and the working modes of the static reactive power generators are regulated and controlled according to the optimized results; wherein the short-term predicted power data is acquired by the offshore wind farm according to a preset time interval.
The optimization module is used for establishing a robust optimization model to optimize the switching group number of the reactor group according to the optimal reactive compensation configuration solution, the day-ahead power prediction data of the offshore wind turbine generator and the optimal switching time point of the in-day reactor, so as to obtain an in-day switching plan of the reactor group;
and when the no-load reactive capacity is larger than the full-generation reactive capacity, determining the capacity of the shunt reactor according to the no-load reactive capacity, the full-generation reactive capacity and the voltage of the grid-connected point of the offshore wind farm.
The capacity of the shunt reactor can comprise reactive compensation capacity of the shunt reactor and voltage regulation capacity of the shunt reactor; the reactive compensation capacity of the shunt reactor is the capacity of the shunt reactor for reactive compensation; the voltage regulation capacity of the shunt reactor is the capacity of the shunt reactor for regulating the voltage of a grid-connected point.
Specifically, when the empty load reactive capacity is larger than the full generation reactive capacity, the reactive compensation of the wind power plant adopts SVG and the shunt reactor for combined compensation, and the total reactive compensation capacity can be confirmed to be the empty load reactive capacity. Further, the calculation result may be obtained by calculating the idle reactive capacity and the full reactive capacity, for example, substituting the idle reactive capacity and the full reactive capacity into a preset calculation formula, and determining the value of the reactive compensation capacity of the shunt reactor as the calculation result, and meanwhile, the absolute value of the reactive compensation capacity of the shunt reactor may be less than or equal to a preset compensation capacity threshold, for example, the preset compensation capacity threshold may be half of the total reactive compensation capacity.
And the compensation module is used for establishing an optimized distribution model among the wind generator sets for optimizing the reactive output of the offshore wind generator sets and the reactive output of the static reactive generators according to the solution of the optimized configuration of the reactive compensation equipment, the daily switching plan of the reactor sets and the short-term predicted power data. And regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the parallel reactor and the no-load reactive capacity so as to perform reactive power compensation on the offshore wind power plant. Wherein the short-term predicted power data is acquired by the offshore wind farm according to a preset time interval.
The droop coefficient of each offshore wind turbine and the reactive power output of the dynamic reactive power compensation device are distributed to each offshore wind turbine, and the reactive power output of each offshore wind turbine is controlled according to the droop coefficient distributed to each offshore wind turbine. By setting the reactive power output of each offshore wind power generation unit and the reactive power output of the dynamic reactive power compensation device, the voltage of a grid connection point of the offshore wind power plant is not recovered to be within a stable range. By setting the reactive power output of each offshore wind power generation unit, the reactive power output of the dynamic reactive power compensation device and performing reactive power compensation optimal configuration on the sub-areas, the voltage of the grid-connected point of the offshore wind power plant is not fluctuated any more, and then the reactive power compensation optimal configuration is realized on the whole offshore wind power base.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (10)
1. An offshore wind power reactive power optimization configuration method is characterized by comprising the following steps:
step 1, respectively acquiring full-load reactive capacity and no-load reactive capacity of an offshore wind farm; the full-power reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind plant during full power generation; the idle reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind farm when the offshore wind farm is idle;
step 2, bringing operation data in the pre-divided sub-areas of the offshore wind power base into a preset reactive power optimization configuration model, and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base;
step 3, establishing a robust optimization model to optimize the switching group number of the reactor group according to the optimal reactive compensation configuration solution, the day-ahead power prediction data of the offshore wind turbine generator and the optimal switching time point of the in-day reactor, so as to obtain an in-day switching plan of the reactor group;
step 4, establishing an optimized distribution model among the wind power units for optimizing the reactive output of the offshore wind power units and the reactive output of the static reactive generators according to the solution of the optimized configuration of the reactive compensation equipment, the daily switching plan of the reactor groups and short-term predicted power data; and regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant.
2. The offshore wind power reactive power optimization configuration method according to claim 1, characterized in that: the method comprises the following steps that step 1, a work flow of a discrete reactive power compensation device in a grid-connected point of an offshore wind farm is further set, and the set work flow is applied to the discrete reactive power compensation device so as to reduce the influence degree of wind speed fluctuation on grid-connected point voltage; the work flow of the discrete reactive power compensation device comprises the switching group number and the switching times, and when the wind speed causes the wind power of the offshore wind power generation set to change greatly, the switching group number of the discrete reactive power compensation device at the moment is preset.
3. The offshore wind power reactive power optimization configuration method according to claim 1, characterized by: and 2, further establishing an optimized distribution model among the wind power units according to the daily switching plan and the short-term predicted power data of the reactor groups to optimize the reactive power output of the offshore wind power units and the reactive power output of the static reactive power generators, and regulating and controlling the reactive power of the offshore wind power units and the working modes of the static reactive power generators according to the optimization results.
4. The offshore wind power reactive power optimization configuration method according to claim 1, characterized by: and step 4, regulating and controlling the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant.
5. The offshore wind power reactive power optimization configuration method according to claim 4, characterized by: and step 4, setting the reactive power output of each offshore wind power generation unit and the reactive power output of the dynamic reactive power compensation device, and performing reactive power compensation optimal configuration on the sub-areas, so that the voltage of a grid-connected point of the offshore wind power plant is not fluctuated any more, and further the reactive power compensation optimal configuration of the whole offshore wind power base is realized.
6. An offshore wind power reactive power optimal configuration system is characterized by comprising:
the acquisition module is used for respectively acquiring full reactive capacity and no-load reactive capacity of the offshore wind farm; the full reactive power capacity is the maximum value of the absolute value of the total reactive power capacity of the offshore wind power plant during full power generation; the idle reactive capacity is the maximum value of the absolute value of the total reactive capacity of the offshore wind farm when the offshore wind farm is idle;
the calculation module is used for bringing operation data in the pre-divided sub-areas of the offshore wind power base into a preset reactive power optimization configuration model and calculating a reactive power compensation optimal configuration solution of the sub-areas of the offshore wind power base;
the optimization module is used for establishing a robust optimization model to optimize the switching group number of the reactor group according to the reactive compensation optimal configuration solution, the day-ahead power prediction data of the offshore wind power generation group and the optimal switching time point of the daily reactor, so as to obtain a daily switching plan of the reactor group;
the compensation module is used for establishing an optimized distribution model among the wind generator sets for optimizing the reactive output of the offshore wind generator sets and the reactive output of the static reactive generators according to the solution of the optimized configuration of the reactive compensation equipment, the daily switching plan of the reactor sets and the short-term predicted power data; and regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive compensation on the offshore wind power plant.
7. The offshore wind power reactive power optimization configuration system according to claim 6, wherein the obtaining module further comprises a work flow for setting a discrete reactive power compensation device in a grid-connected point of the offshore wind farm, and the set work flow is applied to the discrete reactive power compensation device to reduce the influence degree of wind speed fluctuation on grid-connected point voltage; the work flow of the discrete reactive power compensation device comprises the switching group number and the switching times, and when the wind speed causes the wind power of the offshore wind power generation set to change greatly, the switching group number of the discrete reactive power compensation device at the moment is preset.
8. The offshore wind power reactive power optimization configuration system according to claim 6, wherein the calculation module further comprises a step of establishing an optimized distribution model among the wind power units according to the daily switching plan and the short-term predicted power data of the reactor groups to optimize the reactive power output of the offshore wind power units and the reactive power output of the static reactive power generators, and regulating and controlling the reactive power of the offshore wind power units and the working modes of the static reactive power generators according to the optimization results.
9. The offshore wind power reactive power optimization configuration system of claim 6, wherein the compensation module further comprises a function of regulating the reactive power of the offshore wind power generation set and the working mode of the static var generator according to the optimization result, and a function of determining the SVG capacity according to the capacity of the shunt reactor and the no-load reactive capacity so as to perform reactive power compensation on the offshore wind farm.
10. The offshore wind power reactive power optimal configuration system of claim 9, wherein the compensation module further comprises a reactive power compensation optimal configuration module for the sub-area by setting the reactive power output of each offshore wind power generation set, the reactive power output of the dynamic reactive power compensation device, so that the voltage of the grid-connected point of the offshore wind power plant is not fluctuated, and thus the reactive power compensation optimal configuration module is implemented for the whole offshore wind power base.
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